/* 横向排列 */
.jcc {
    display: flex;
    justify-content: center;
}

.aic {
    display: flex;
    align-items: center;
}

.fjc {
    display: flex;
    justify-content: center;
    align-items: center;
}

.fja {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.jsb {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 纵向排列 */
.fc {
    display: flex;
    flex-direction: column;
}